- Author
- National Bureau of Standards | Food and Drug Administration
- Coporate
- National Bureau of Standards, Washington, DC Food and Drug Admin., Washington, DC
- Report
- NBS SP 412, October 1974,
- Book or Conf
- National Bureau of Standards and Food and Drug Administration. Aerosol Measurements: Proceedings of a Seminar. May 7, 1974, Gaithersburg, MD, Cassatt, W. A.; Maddock, R. S., Editors, 412 p., 1974
- Keywords
- aerosols | lasers | light scattering
- Identifiers
- aerosol instrument performance; aerosol measuring instruments; beta-ray adsorption; Doppler shift; electromobility; optical imaging; piezoelectric effect
- Abstract
- Papers followed by verbal discussions were given in a seminar and workshop sponsored by the National Bureau of Standards and the Food and Drug Administration to define the state of development of aerosol measuring instruments. The instruments discussed were based upon a variety of operating principles including laser light scattering, optical imaging, Doppler shift, electromobility, piezoelectric effect, and beta-ray adsorption. Two review papers were given which described other phenomena upon which aerosol measurements are based. The general summary includes a table which lists the specifications of the instruments discussed to illustrate the range of capabilities availabe in this field. Discussion among seminar attendees revealed that many questions remain to be answered before the more difficult aerosol measurements problems can be solved. For example, in the anlaysis of very dense aerosols questions arise concerning coincidence losses or agglomeration effects that may result from collisions between particles as they are drawn into the measuring volume. Volatilization or condensation effects may alter the size distribuiton if the measurements are made late in time. Finally, variations in particle shape or index of refraction can alter the instrument response and cause difficulties in interpretation.